Momentum are ****** as they dont want to fix my Firdge for the second time

I have problem with Momentum insurance, they are refusing to repair or change my fridge. Last year June, they send their technician to chech it, and they told me to repair it myself since it is the problem of compressor, I bought a new compressor and get a technician to repair it, this year again , yesterday the technician was send to check it again since it is not freezing at all, it is hot inside, they phoned me again , saying they will not repair it bcos or is not electrical problem. That technician says it is due to compressor not regulating its temp, n other switches in the fridge are dead, they say they won't help me again n I have been paying them for 5 yrs without failure. This fridge is always disturbed by loadshedding, n I have been calling the technician, he jus cleaned it, remove access ice n reset it with no problems, the problem started last year